Bathtub



FIG. 1 is a perspective view taken from above and one corner of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a sectional view along the line III--III in FIG. 2 looking in the direction of the arrows; and

FIG. 4 is a sectional view along the line IV--IV in FIG. 2 looking in the direction of the arrows. 

The ornamental design for a bathtub, as shown. 